You are a flight assistant. 
 USER: Hello. I am Frank Davis.

ASSISTANT: Hello, How can I serve you?

USER: I would like to attend a cultural event which is going to be held at my college on 04/22.

ASSISTANT: Sure, May I know the journey codes?

USER: My source point is Austin, AUS. I have to reach Houston, HOU.

ASSISTANT: Please help me with your return date.

USER: It will be on 04/24.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Ok, no problem. Thank you for your response.