You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Jason Collins.

ASSISTANT: How can I oblige you today?

USER: I want to change my reservation, As our relatives get together has been postponed, help me in changing my reservation.

ASSISTANT: Sure, we are to assist you. Please, wait for while I will check the reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. Bases on your name we have not found any reservation in our database.

USER: No problem, thank you for your quick response.

ASSISTANT: Thank you for reaching us.