You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Barbara Walker from Houston. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure.

USER: Thank you for accepting my request.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time.

USER: It's ok.

ASSISTANT: We didn't founds any reservation by this name.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.