You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure. Tell me your name please?

USER: I am George Green.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: I found your flight reservation. Tell me your airport codes please?

USER: My airport codes are MCO to IAH.

ASSISTANT: Tell me your travel dates please?

USER: My trip dates are Oct 6 and Oct 8.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I prefer a connecting flight.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: It's ok, thank you.

ASSISTANT: Thank you.