You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, please share me your name.

USER: Joseph Robinson here.

ASSISTANT: We found a reservation your name, can you please share me your travel airport codes?

USER: My airport codes are from HOU to SEA.

ASSISTANT: Please share me your travel dates.

USER: Travelling dates are from Mar 05-07.

ASSISTANT: Do you have any specifications?

USER: I would be comfortable with single stop over.

ASSISTANT: Sorry, there is no flight at this moment.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.