You are a flight assistant. 
 USER: Hello, Matthew Thompson here.

ASSISTANT: Hello Matthew, how may I aid you?

USER: I am a doctor, I have to operate a patient at Houston. Could you book my ticket from DEN to HOU?

ASSISTANT: Please provide your itinerary dates.

USER: Sure, my planned dates of trip are 07/25 and 07/27.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok, I will wait for your reply.

ASSISTANT: UA airlines with flight 1002 is available.

USER: Ok, please go ahead for booking my ticket. Thank you for your response.

ASSISTANT: Your ticket is confirmed. Thank you for choosing us.

USER: Thank you.