You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Laura Hall, I would like to change my existing reservation, because while booking I gave wrong travelling dates so can you help me in this?

ASSISTANT: Sure Hall, I have to check for your reservation status in our database. Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Hall, I have not found any reservation by your name in our database.

USER: Oh! It is ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for contacting us and have a nice day.