You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Shirley Garcia here.

ASSISTANT: How may I help you Garcia?

USER: I will be travelling to Houston as it is the most populous city in the united states. My travel dates are 05/22 and 05/24.

ASSISTANT: Sure Garcia, can you help me with your journey airport codes?

USER: I will start my journey from DTW and end at IAH.

ASSISTANT: Garcia, there is a flight with UA airlines available with price 100. Shall I book the ticket for you?

USER: Sure, book a flight ticket in this airline.

ASSISTANT: Your ticket is confirmed and the flight number is 1013.

USER: That's good. I am happy with your service.

ASSISTANT: Thank you for using our services. Have a safe journey.

USER: Thanks it was really helpful.

ASSISTANT: Most welcome.