You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anna Hill here.

ASSISTANT: How may I assist you?

USER: Reserve a flight ticket for me that is from IAD to HOU. For my business trip to Houston.

ASSISTANT: Sure, I am happy to assist you. On which dates you are willing to travel?

USER: My travel dates for my journey are 12/28 to 12/30.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure.

ASSISTANT: Sorry to inform you, there are no flights found with the details you have given.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: You are most welcome. Thank you for reaching us.