You are a flight assistant. 
 USER: Hello, I am Lisa Lopez.

ASSISTANT: Hello, Lisa Lopez. How can I help you today?

USER: As I am planning to go for gathering at sisters house at Phoenix. Can you book flight ticket on 11/02 with the fare of 200?

ASSISTANT: Ok, can you please provide me your airport codes?

USER: Airport codes: HOU - PHX.

ASSISTANT: May I know your day of return?

USER: My return date is 11/04.

ASSISTANT: Do you have any connection limit?

USER: There is no connection limit.

ASSISTANT: Please wait a moment I will get back to you with the availability of flights.

USER: Sure.

ASSISTANT: Sorry that there were no flights available on your specifications. Thank you for opting us. Have a nice day.

USER: Ok, no issue. Thank you for assisting me.