The team travel contract was signed by a representative who was not in my handwriting, and the travel agency issued a bill. If there is a dispute later, is the contract valid?

1. From the point of view, one party to the contract may be the unit (representing the place of work) and the other party is the travel agency. If it is. Even if there is no representative signature, the contract is valid as long as the subordinate unit seals it.

Second, if the representative is a personal representative, even if the signature of the representative is not my own handwriting, it is valid as long as both parties actually perform it (especially the travel agency may keep relevant evidence to prove that both parties actually perform it).