You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Eric Lopez. I need to attend a business meeting in Houston. Can you help me to book a ticket from LAS to HOU?

ASSISTANT: Sure, may I know your journey dates for better search?

USER: I would like to depart on 11/24 and return by 11/26.

ASSISTANT: Please give me a minute, Lopez.

USER: Sure, take your time.

ASSISTANT: Eric, there are no flights available at this moment.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.