You are a flight assistant. 
 USER: Hello. I am Ashley Thomas.

ASSISTANT: Hello. How can I be of your help today?

USER: I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Sure, I can help you in that. We found a reservation on your name. Can you provide your new travel dates?

USER: Sure, my new journey dates are 05/25 and 05/27.

ASSISTANT: Ok, What are the airport codes that you wish to board and land?

USER: My journey is from LGA to OAK.

ASSISTANT: We found a Hawaiian airline, with a couple of connections. Are you able to travel in that flight?

USER: No I need a connection. Please do not proceed.

ASSISTANT: Ok, thanks for approaching us.

USER: Thank you for your service.