You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Moore here.

ASSISTANT: How can I serve you?

USER: Due to some urgent work in my office, I want to alter my trip dates. Can you do this for me?

ASSISTANT: Sure, I will change your recent booking. Please wait for a while to check your recent booking and I will get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting. I could not found any recent booking on the name which you have provide when I check in my data base.

USER: It's ok. Thank you for searching.

ASSISTANT: Thank you for your time in reaching us, have a nice day.