You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to fly on 12/17 to 12/19 with a single connection. Will you help me in flight booking?

ASSISTANT: Sure, can you help me with your journey airport codes?

USER: My source from TX - HOU and my destination is AZ - PHX.

ASSISTANT: May I know your name please?

USER: Sure, my name is Dennis Green.

ASSISTANT: Thank you for your information. sorry, we did not found any flights on your given information.

USER: Ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.