You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Clark.

ASSISTANT: Clark, how may I help you?

USER: I am planning to visit Houston, can you please book me a ticket from DCA to HOU?

ASSISTANT: I am glad to help you, could you please let me know your travel dates?

USER: My planned dates of journey are from 10/19 to 10/21.

ASSISTANT: Flight-1018 is available with Delta airlines and the ticket fare is 200 only. Is it ok for you?

USER: Please go ahead with my ticket booking process.

ASSISTANT: Clark, your ticket is confirmed successfully.

USER: Thank you for booking my ticket.

ASSISTANT: You are welcome and thank you for choosing us.