You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mary Thomas here.

ASSISTANT: Thomas, how can I serve you today?

USER: I want to meet my mother-in-law at Dallas, so please book my ticket from Chicago.

ASSISTANT: Ok, may I know your preferred dates of journey?

USER: My itinerary dates are 04/22 and 04/24.

ASSISTANT: Can I know your airport codes?

USER: I will travel from ORD to DFW.

ASSISTANT: Please hold on.

USER: Sure.

ASSISTANT: Flight-1002 of Spirit airlines is available for you, can I book?

USER: Please book my ticket.

ASSISTANT: Your ticket is reserved successfully.

USER: Thank you.

ASSISTANT: Thank you.