You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Helen Evans here.

ASSISTANT: Glad to know you, Helen. How can I help you?

USER: I would like to visit Museum of fine arts at Houston, can you please help me to book a ticket from TX-DFW to TX-IAH?

ASSISTANT: May I know your preferred dates for travelling, please?

USER: Sure, my departure and return dates are from 09/12 to 09/14.

ASSISTANT: As per your details, there is no flight available on those dates.

USER: Ok, no issues.

ASSISTANT: Do you need any other help from us?

USER: No. Thank you for your service.

ASSISTANT: Fine, thank you for choosing us.

USER: Welcome.