You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Alexander Lopez. I want to visit Austin to meet my father for his birthday.

ASSISTANT: Sure, I am happy to help you with that. Can you please share your travelling dates?

USER: So, please help me to reserve a flight ticket on 04/13 and 04/15.

ASSISTANT: I need your source and destination airport codes to proceed further?

USER: My travel codes are MCO and AUS.

ASSISTANT: Please wait for a while, I will get back with your flight details.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Ok, thanks for informing.

ASSISTANT: Thank you for reaching us.