You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Jones here.

ASSISTANT: Rachel Jones, how may I render you?

USER: I want to attend a Marriage in San Francisco. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travelling dates are 04/01 and 04/03.

ASSISTANT: May I know your genesis and terminus airport codes?

USER: My airport codes are HOU and SFO.

ASSISTANT: Do you have any specifications?

USER: I would prefer single halt.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, no flights are available on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.