You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Carol Baker. I am looking for a direct flight from IAD to OAK, can you please help me to book my flight ticket?

ASSISTANT: Sure, Can you please mention your preferable journey dates?

USER: Sure, I will depart on 09/12 and return on 09/14.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait for your response.

ASSISTANT: I am sorry to say that there is no flight found with that connection.

USER: Not an issue, I will find an other to reach my destination. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a great day.