You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Thompson.

ASSISTANT: How can I support you today?

USER:  I need to change my existing reservation. Due, to postpone of my document verification in office. Can You help me out?

ASSISTANT: Sure. Please, wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for availing us.