You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I serve you?

USER: We friends were planning to meet after a long time at Houston, please help me in booking a flight ticket with single connection on 07/19.

ASSISTANT: Sure, May I know the journey codes?

USER: Sure, I will take off from SFO and land on HOU.

ASSISTANT: Please help me with your return date and your name.

USER: I will back on 07/21.

ASSISTANT: May I know your name?

USER: Sure, I am Barbara Hill.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: Thank you for availing us.