You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Good Evening.

USER: Good evening, Emily Smith here.

ASSISTANT: What can I do for you Emily Smith?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you for your positive response.

ASSISTANT: Please wait a moment, so that I can check your previous reservation in our records.

USER: Ok, take your time.

ASSISTANT: Sorry, We regret to inform that I didn't find your reservation under your name.

USER: That's ok, no issues. Thank you for informing me about my request.

ASSISTANT: It's my pleasure.