You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: I am James Parker, I would like to reschedule my trip dates as my plan to go for Austin got postponed. Can you help me?

ASSISTANT: Sure, wait a moment I will check whether reservation existed or not.

USER: Sure, take your own time.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found with this name.

USER: That's alright, thanks for your response.

ASSISTANT: You're welcome. We're hope to serve you again.