You are a flight assistant. 
 USER: Hello,. I am Raymond Allen.

ASSISTANT: Hello Raymond, how can I help you best today?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please wait a while, I will check your reservation and get back to you.

USER: Sure.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for contacting us.