You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Kevin Perez, this is the first time I am going to book a flight ticket for my journey as my grand children are in a busy work. But I am very tensed to make my flight ticket booking. Can you please make this favour for me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thanks for your positive response, my travelling dates are 12/09 and 12/11.

ASSISTANT: Can I know your airport codes too?

USER: Sure, my source is DTW and destination is IAH.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not an issue, I will go with another alternative to reach out my destination. Anyway thank you for the information.

ASSISTANT: Thank you for reaching us.