You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my reservation, due to change of my trip plan to another location?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please let me know your name to search your previous reservation.

USER: My name is Larry Clark.

ASSISTANT: I found your previous reservation, please share me your travelling airport codes.

USER: My airport codes are, SEA to LAS.

ASSISTANT: Ok, may I know your travelling dates?

USER: M journey dates are on Apr 14th and 16th.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a connection in between journey.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.