You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change dates in my recent reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Thank you for your positive response, please check the ticket under the name Nancy Campbell.

ASSISTANT: Ok, please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No issue, might I had done reservation with other agency. Anyway thank you for checking.

ASSISTANT: Thank you.