You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Dennis Taylor.

ASSISTANT: Dennis Taylor, how can I assist you?

USER: As I have done a reservation accidentally last week with wrong airports but I have lot of ways to change my reservation but for a last try with your service. Can you please help in modification of my reservation?

ASSISTANT: Sure, please give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

USER: Not an issue with that, anyways thank you for the information.

ASSISTANT: Thank you for contacting us.