You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: I need to change my trip dates in my recent reservation, can you serve me in changing this?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: May I know your name to check your details in our database?

USER: Lisa Evans is my name, you can check with this.

ASSISTANT: Please wait a while.

USER: OK.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: OK. Not a problem, Thanks for your time with us.

ASSISTANT: Thank you for choosing us.