You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Mary Walker. I am planning to change existing reservation, due to some urgent work.

ASSISTANT: Ok, give me a minute let me check your status of reservation.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, I got your reservation in our database, can you help me with your preferable dates to go?

USER: I would like to travel on 10/29 and return back on 10/31.

ASSISTANT: Ok, may I know your locations too?

USER: My nearest source airport code is LAX and destination airport code is LAX.

ASSISTANT: Ok, wait a moment.

USER: Make sure my connection limit is 0.

ASSISTANT: Sorry, there is no direct flight for you with your new preferences.

USER: That's fine.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your help.