You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Nancy White.

ASSISTANT: How may I help you today?

USER: I am willing to attend an exhibition in Atlanta city in the month of August. Can you please help me to book my flight ticket from Detroit?

ASSISTANT: Sure, I will be helping out, can you please mention your nearest airport codes in which you are travelling?

USER: Thank you for considering my request, my nearest airport codes are DTW and ATL.

ASSISTANT: Can you mention your Planned travel dates.

USER: Sure, my planned travel dates are 08/12 and 08/14.

ASSISTANT: Please hold a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Nancy, all the flight tickets are sold out due to International exhibition is going on that place.

USER: No problem with that one, I can prefer any other source to reach my destination. Thank you for your help.

ASSISTANT: Thank you for reaching our service.