You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I have done my reservation last week for my exams in Boston city but due to some technical issue in that university they have changed my exam destination to Dallas. Can you please help me to change my reservation?

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is Stephan Martin.

ASSISTANT: Ok, I have searched your reservation. So that can you please tell me your new travelling dates?

USER: Good to hear, my travelling dates are Dec 10 and Dec 12.

ASSISTANT: May I know your travelling airport codes?

USER: Sure, my nearest airport codes are SFO and DFW.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight for my journey.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, flights available on your route to change.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.