You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Thompson here.

ASSISTANT: How may I assist you?

USER: Can you help me to book a flight ticket from HOU to LAX?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I would like to travel on 06/22 and return on 06/24.

ASSISTANT: Helen Thompson , there are no flights available in your route.

USER: Oh! not a problem. Thank you for giving information.

ASSISTANT: Thank you for reaching us.