You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

USER: Can you please change my reservation, due to an emergency?

ASSISTANT: Sure, can you please provide me your good name?

USER: My name is Joshua Carter.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: We found reservation on your name. Can you please share me your new departure and arrival dates?

USER: My journey dates are on Dec 13th and 15th.

ASSISTANT: Ok, may I know your airport codes please?

USER: My airport codes are, SFO to IAH.

ASSISTANT: Do you need a lay by in between the journey?

USER: I prefer one lay by in my journey.

ASSISTANT: There are no flights found on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.