You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Suddenly I got a call from my project manager to attend the meeting on the same departure date, so I am looking to change my travel dates. Can you please help me in changing the details?

ASSISTANT: Sure, can you please let me know your name for checking purpose?

USER: Thank you for your response. My  name is Gregory Campbell.

ASSISTANT: Thank you for waiting, there is no reservation found for he user name in our data base.

USER: It's ok, thank you for checking my ticket status and for providing the information.

ASSISTANT: It's my pleasure and thank you for reaching us, have a nice day.