You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jason Wilson here.

ASSISTANT: Jason Wilson, how may I aid you?

USER: I would like to change my existing reservation because my brother marriage was postponed, can you help me?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.