You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to reschedule my journey dates, as I got an emergency work at my place. Will you assist me in changing the reservation with the name of Timothy Lee?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Sure, I will wait.

ASSISTANT: Thank you for your valuable time.

USER: Fine.

ASSISTANT: We are sorry to inform you that, no reservation was found on your name.

USER: Not a issue.

ASSISTANT: Ok.

USER: Thank you for your quick response.

ASSISTANT: Thank you for reaching us, have a good day.